He remembers the arrest as if it just happened. When two officers approached Martin on Oct. 23 on Eldorado Parkway, ordering him to drop a sign that read "Police Ahead," he pulled out his mobile phone to record his arrest.

Frisco police cited him for violating the city's sign ordinance, which says the person holding a sign has to be on private property. Martin was in the median. But he argued that Frisco's ordinance doesn't apply to him since he's not a business, and that he has a First Amendment right to warn drivers of a speed trap in his community.

"I have a personal interest in keeping everybody safe... as much as I possibly can," Martin said.

In an earlier interview, Martin said he is not opposed to speed traps. "I think it's absolutely important for officers to be on the streets and enforce laws," he said.

He said his goal was to slow down drivers in his area of Preston Highlands. Some people have even come up to him and thanked him. "'I go through that area (slower) now I remember you holding that sign. So now I don't speed anymore and I'm a lot more mindful,'" he said one person told him.

Martin stressed he received a lot of help from his attorney Mark Meisenger. But Frisco police still have his sign, and he has every intention of getting that back.